3894818 is referenced by 37 patents and cites 7 patents.

This invention relates to in-hole motors in which thrust bearings are provided with means to lubricate the bearings employing pressure balanced seals. The preferred embodiment includes the application of such sealed bearings to progressing cavity motors for use in drilling operations.

Title
In-hole motors
Application Number
05/354,954
Publication Number
3894818
Application Date
April 27, 1973
Publication Date
July 15, 1975
Inventor
Tschirky John E
Assignee
Smith International
IPC
F16c 01/24
E21b 03/12
F01c 01/10
F03C 02/00
F03C 02/08
E21B 04/00
E21B 04/02
F16C 19/00
F16C 19/54
F16J 15/18
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